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Derivations can output "text-hashed" data

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In particular, this means that derivations can output derivations. But
that ramification isn't (yet!) useful as we would want, since there is
no way to have a dependent derivation that is itself a dependent
derivation.
This commit is contained in:
John Ericson 2020-10-12 23:51:23 +00:00
parent a0f369aa3f
commit a4e5de1b9d
15 changed files with 322 additions and 137 deletions
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3
tests/local.mk
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@ -35,7 +35,8 @@ nix_tests = \
recursive.sh \
describe-stores.sh \
flakes.sh \
content-addressed.sh
content-addressed.sh \
text-hashed-output.sh
# parallel.sh
# build-remote-content-addressed-fixed.sh \

29
tests/text-hashed-output.nix Normal file
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@ -0,0 +1,29 @@
with import ./config.nix;
# A simple content-addressed derivation.
# The derivation can be arbitrarily modified by passing a different `seed`,
# but the output will always be the same
rec {
root = mkDerivation {
name = "text-hashed-root";
buildCommand = ''
set -x
echo "Building a CA derivation"
mkdir -p $out
echo "Hello World" > $out/hello
'';
__contentAddressed = true;
outputHashMode = "recursive";
outputHashAlgo = "sha256";
};
dependent = mkDerivation {
name = "text-hashed-root.drv";
buildCommand = ''
echo "Copying the derivation"
cp ${root.drvPath} $out
'';
__contentAddressed = true;
outputHashMode = "text";
outputHashAlgo = "sha256";
};
}

26
tests/text-hashed-output.sh Normal file
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@ -0,0 +1,26 @@
#!/usr/bin/env bash
source common.sh
# In the corresponding nix file, we have two derivations: the first, named root,
# is a normal recursive derivation, while the second, named dependent, has the
# new outputHashMode "text". Note that in "dependent", we don't refer to the
# build output of root, but only to the path of the drv file. For this reason,
# we only need to:
#
# - instantiate the root derivation
# - build the dependent derivation
# - check that the path of the output coincides with that of the original derivation
drv=$(nix-instantiate --experimental-features ca-derivations ./text-hashed-output.nix -A root)
nix --experimental-features 'nix-command ca-derivations' show-derivation --derivation "$drv"
drvDep=$(nix-instantiate --experimental-features ca-derivations ./text-hashed-output.nix -A dependent)
nix --experimental-features 'nix-command ca-derivations' show-derivation --derivation "$drvDep"
out1=$(nix-build --experimental-features ca-derivations ./text-hashed-output.nix -A dependent --no-out-link)
nix --experimental-features 'nix-command ca-derivations' path-info $drv --derivation --json | jq
nix --experimental-features 'nix-command ca-derivations' path-info $out1 --derivation --json | jq
test $out1 == $drv